Turk, Amos. Ecology, pollution, environment / Amos Turk, Jonathan Turk and Janet T. Wittes. - Philadelphia : Saunders, 1972. - ix, 217 p. : illus. ; 23 cm. - Sunders golden series . Includes bibliographies. Open access. ISBN: LCCN: 74176218 Subjects--Topical Terms: Pollution.Ecology.Population.